fix indentations for resources blocks and bump up memory limit for DCGM

[movence]

Issue #, if available:

• Wrong indentation values are used for resources blocks causing unknown fields errors

  helm install --wait --create-namespace --namespace amazon-cloudwatch amazon-cloudwatch ./charts/amazon-cloudwatch-observability --set clusterName=test-cluster --set region=us-west-2
  W0719 10:36:54.976442   16872 warnings.go:70] unknown field "spec.template.spec.limits"
  W0719 10:36:54.976470   16872 warnings.go:70] unknown field "spec.template.spec.requests"
  W0719 10:36:54.977537   16872 warnings.go:70] unknown field "spec.template.spec.limits"
  W0719 10:36:54.977553   16872 warnings.go:70] unknown field "spec.template.spec.requests"
  W0719 10:36:55.237276   16872 warnings.go:70] unknown field "spec.limits"
  W0719 10:36:55.237315   16872 warnings.go:70] unknown field "spec.requests"
  W0719 10:36:55.239300   16872 warnings.go:70] unknown field "spec.limits"
  W0719 10:36:55.239323   16872 warnings.go:70] unknown field "spec.requests"
  W0719 10:36:55.433433   16872 warnings.go:70] unknown field "spec.limits"
  W0719 10:36:55.433460   16872 warnings.go:70] unknown field "spec.requests"
  W0719 10:36:55.610348   16872 warnings.go:70] unknown field "spec.limits"
  W0719 10:36:55.610372   16872 warnings.go:70] unknown field "spec.requests"

• Crashing DCGM pods with OOM (ExitCode 137) with the default memory limit of 250Mi

Description of changes:

• Fix indentation values used with nindent
• Increase the default memory limit to 500Mi for DCGM Exporter container

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